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Plex for Android
Messenger, Facebook
RoyalBlue
96x96
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Plex
Messenger
512x512
Squareplex
Boxed Metal Icons
Hex Icons
Mobile apps
Flat
Hex ICO
128x128
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Social media
Pixel
Simply 8-bits #4
Facebook, Messenger
Mixed
Simply 8-bits #6
imo, beta, Messenger
imo, Messenger
Desktop apps